如何使用codeigniter中的活动记录查询指定时间之间的日期

I have a database that I want to pull only certain rows that have dates in specified ranges. I'm not sure how to do this properly in active record. Right now it looks like I'm running a standard mysql query inside of an active record query. I hope this gives you the idea of what I'm looking for. I have a database that I want to pull only cert